抄録
Current status of research on the Laser Launch System are reviewed. The aim of the LLS development is
to drastically reduce the launch cost from ground to the orbit. After looking back the history of the LLS
research, two different kinds of propulsion, the RP laser propulsion and the CW laser propulsion are introduced.
Recent research activities on each kind of the propulsion are reviewed. For the RP laser propulsion,
the beam-riding performance is pursued. For the CW laser propulsion, the launch demonstration
using a 100 kW-class-fiber laser is planned in Japan.
